Grist: Humans will have to not only stop emitting greenhouse gases by 2085, but also develop technology that will result in negative emissions - the removal of 15 billion tons of carbon dioxide from the atmosphere each year by the end of the century - in order to prevent global warming from exceeding 2 degrees C (3.6 degrees F), according to a new study.
Human greenhouse gas emissions, including methane and carbon dioxide, have already warmed the globe more than 1 degree C (1.8 degrees F) compared to...